-er a-a a-b a-c aaa aab aac aae aaf aah aam aao aar ab- aba abb abc abe abf abh abm abo abr ac- aca acb acc ace acf ach acm aco acr aea aeb aec aee aef aeh aem aeo aer af- afa afb afc afe aff afh afm afo afr aha ahb ahc ahe ahf ahh ahm aho ahr ama amb amc ame amf amh amm amo amr aoa aob aoc aoe aof aoh aom aoo aor ar- ara arb arc are arf arh arm aro arr baa bab bac bae baf bah bam bao bar bba bbb bbc bbe bbf bbh bbm bbo bbr bca bcb bcc bce bcf bch bcm bco bcr be- bea beb bec bee bef beh bem beo ber bfa bfb bfc bfe bff bfh bfm bfo bfr bha bhb bhc bhe bhf bhh bhm bho bhr bma bmb bmc bme bmf bmh bmm bmo bmr boa bob boc boe bof boh bom boo bor bra brb bre brf brh brm bro brr c-- caa cab cac cae caf cah cam cao car cba cbb cbc cbe cbf cbh cbm cbo cbr cca ccb ccc cce ccf cch ccm cco ccr ce- cea ceb cec cee cef ceh cem ceo cer cfa cfb cfc cfe cff cfh cfm cfo cfr ch- cha chb chc che chf chh chm cho chr cma cmb cmc cme cmf cmh cmm cmo cmr co- coa cob coc coe cof coh com coo cor cra crb crc cre crf crh crm cro crr eaa eab eac eae eaf eah eam eao ear eba ebb ebc ebe ebf ebh ebm ebo ebr ec- eca ecb ecc ece ecf ech ecm eco ecr eea eeb eec eee eef eem eeo eer ef- efa efb efc efe eff efh efm efo efr eha ehb ehc ehe ehf ehh ehm eho ehr em- ema emb emc eme emf emh emm emo emr eo- eoa eob eoc eoe eof eoh eom eoo eor era erb erc ere erf erh erm ero err faa fab fac fae faf fah fam fao far fba fbb fbc fbe fbf fbh fbm fbo fbr fca fcb fcc fce fcf fcm fco fcr fea feb fec fee fef feh fem feo fer ffa ffc ffe fff ffh ffm ffo ffr fha fhb fhc fhe fhf fhh fhm fho fhr fma fmb fmc fme fmf fmh fmm fmo fmr foa fob foc foe fof foh fom foo for fra frb frc fre frf frh frm fro frr haa hab hac hae haf hah ham hao har hba hbb hbc hbe hbf hbh hbm hbo hbr hca hcb hcc hce hcf hch hcm hco hcr he- hea heb hec hee hef heh hem heo her hfa hfb hfc hfe hff hfh hfm hfo hfr hha hhb hhc hhe hhf hhh hhm hho hhr hma hmb hmc hme hmf hmh hmm hmo hmr hoa hob hoc hoe hof hoh hom hoo hor hr- hra hrb hrc hre hrf hrh hrm hro hrr m-f m-o m-r maa mab mac mae maf mah mam mao mar mba mbb mbc mbe mbf mbh mbm mbo mbr mc- mca mcb mcc mce mcf mch mcm mco mcr mea meb mec mee mef meh mem meo mer mfa mfb mfc mfe mff mfh mfm mfo mfr mha mhc mhf mhh mhm mho mhr mma mmb mmc mme mmf mmh mmm mmo mmr moa mob moc moe mof moh mom moo mor mra mrb mrc mre mrf mrh mrm mro mrr oaa oab oac oae oaf oah oam oao oar ob- oba obb obc obe obf obh obm obo obr oc- oca ocb occ ocf och ocm oco ocr oea oeb oec oee oef oeh oem oeo oer of- ofa ofb ofc ofe off ofm ofo ofr oha ohc ohe ohf ohh ohm oho ohr om- oma omb omc ome omf omh omm omo omr oo- ooa oob ooc oof ooh oom ooo oor or- ora orb orc ore orf orh orm oro orr ra- raa rab rac rae raf rah ram rao rar rba rbb rbc rbe rbf rbh rbm rbo rbr rca rcb rcc rce rcf rch rcm rco rcr re- rea reb rec ree ref reh rem reo rer rfa rfb rfc rfe rff rfh rfm rfo rfr rh- rha rhb rhc rhe rhf rhh rhm rho rhr rma rmb rmc rme rmf rmh rmm rmo rmr roa rob roc roe rof roh rom roo ror rra rrb rrc rrf rrh rrm rrr